views: Make view::Views::GetPreferredSize() const.

ui/views/window/custom_frame_view.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/window/custom_frame_view.h"
 
 #include <algorithm>
 
 #include "base/strings/utf_string_conversions.h"
 #include "grit/ui_resources.h"
@@ skipping 203 matching lines @@
 
 void CustomFrameView::Layout() {
   if (ShouldShowTitleBarAndBorder()) {
     LayoutWindowControls();
     LayoutTitleBar();
   }
 
   LayoutClientView();
 }
 
-gfx::Size CustomFrameView::GetPreferredSize() {
+gfx::Size CustomFrameView::GetPreferredSize() const {
   return frame_->non_client_view()->GetWindowBoundsForClientBounds(
       gfx::Rect(frame_->client_view()->GetPreferredSize())).size();
 }
 
-gfx::Size CustomFrameView::GetMinimumSize() {
+gfx::Size CustomFrameView::GetMinimumSize() const {
   return frame_->non_client_view()->GetWindowBoundsForClientBounds(
       gfx::Rect(frame_->client_view()->GetMinimumSize())).size();
 }
 
 gfx::Size CustomFrameView::GetMaximumSize() {
   gfx::Size max_size = frame_->client_view()->GetMaximumSize();
   gfx::Size converted_size =
       frame_->non_client_view()->GetWindowBoundsForClientBounds(
           gfx::Rect(max_size)).size();
   return gfx::Size(max_size.width() == 0 ? 0 : converted_size.width(),
@@ skipping 342 matching lines @@
                    rb.GetImageNamed(normal_image_id).ToImageSkia());
   button->SetImage(CustomButton::STATE_HOVERED,
                    rb.GetImageNamed(hot_image_id).ToImageSkia());
   button->SetImage(CustomButton::STATE_PRESSED,
                    rb.GetImageNamed(pushed_image_id).ToImageSkia());
   AddChildView(button);
   return button;
 }
 
 }  // namespace views